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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of moisture and vertical pressure on airflow resistance through oat grain
    Wpływ wilgotności i nacisku pionowego na opory przepływu powietrza przez ziarno owsa
    Autorzy:
    Kobus, Z.
    Guz, T.
    Kusińska, E.
    Nadulski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/288697.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    opór przepływu powietrza
    wilgotność
    napór pionowy
    owies
    airflow resistance
    moisture
    vertical pressure
    oats
    Opis:
    The article presents the results of research on the airflow resistance through oat grain. The measurements were performed using raw material with the moisture ranging from 14% to 22% with variable load of its layer from 0 to 70 kPa over a period of seven days from the time the tank was filled. The airflow velocity was changed within the range from 0.1 to 1.0 m*s-1. Key importance of the influence of the airflow velocity and mutual interactions between the storage time, vertical pressure and the moisture of the material on the value of hydraulic resistance has been determined.
    W artykule przedstawiono wyniki badań dotyczące oporu przepływu powietrza powietrza przez ziarno owsa. Pomiary przeprowadzono na surowcu o wilgotności od 14 do 22%, przy zmiennym obciążeniu jego warstwy od 0 do 70 kPa w okresie siedmiu dni od momentu napełnienia zbiornika. Prędkość przepływu powietrza zmieniano w zakresie od 0,1 do 1,0 m*s-1. Wykazano kluczowe znaczenie wpływu prędkości przepływu powietrza i wzajemnych interakcji pomiędzy czasem składowania, naciskiem pionowym i wilgotnością surowca na wartość oporu hydraulicznego.
    Źródło:
    Inżynieria Rolnicza; 2011, R. 15, nr 7, 7; 29-35
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Loss coefficients of ice slurry in sudden pipe contractions
    Autorzy:
    Mika, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/240917.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    opór przepływu
    przepływ zawiesiny lodowej
    straty ciśnienia
    Współczynnik strat lokalnych
    flow resistance
    Ice slurry flow
    Local loss coefficient
    Pressure losses in contraction
    Opis:
    In this paper, flow systems which are commonly used in fittings elements such as contractions in ice slurry pipelines, are experimentally investigated. In the study reported in this paper, the consideration was given to the specific features of the ice slurry flow in which the flow behaviour depends mainly on the volume fraction of solid particles. The results of the experimental studies on the flow resistance, presented herein, enabled to determine the loss coefficient during the ice slurry flow through the sudden pipe contraction. The mass fraction of solid particles in the slurry ranged from 5 to 30%. The experimental studies were conducted on a few variants of the most common contractions of copper pipes: 28/22 mm, 28/18 mm, 28/15 mm, 22/18 mm, 22/15 mm and 18/15 mm. The recommended (with respect to minimal flow resistance) range of the Reynolds number (Re about 3000-4000) for the ice slurry flow through sudden contractions was presented in this paper.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 3; 78-86
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the turbulent thermo-fluid performance in a circular heat exchanger with a novel flow deflector-type baffle plate
    Autorzy:
    Rahman, Md Atiqur
    Dhiman, Sushil Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/27311453.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    thermo-fluid performance
    flow resistance
    swirl flow
    trapezoidal deflector
    inclination angle
    recirculation
    opór przepływu
    przepływ wirowy
    recyrkulacja
    deflektor trapezowy
    kąt nachylenia
    wydajność termopłynu
    Opis:
    An axial flow tubular heat exchanger has been experimentally investigated to augment the heat transfer rate with a novel swirl flow of air past the heated tubes. The novel design has been based on circular baffle plates provided with trapezoidal air deflectors of various inclination angles. The arrangement of tubes is kept the same throughout the experiment, in accordance with the longitudinal airflow direction. The tubes maintained a constant heat flux condition over the surface. Four deflectors with equal inclination angles were developed on each baffle plate, generating air swirl inside a circular duct carrying the heated tubes that increase air-side turbulence and, consequently, the surface heat transfer rate. The baffle plates were placed equidistant from each other at variable pitch ratios. The Reynolds number was kept in the range of 16000– 28000. The effect of pitch ratios and inclination angles on the thermo-fluid performance of the heat exchanger was studied. The investigations revealed an average improvement of 3.75 times in thermo-fluid performance for an exchanger with a deflector baffle plate with a baffle inclination angle of 50_ and a pitch ratio of 1.4 when compared to other inclination angles and pitch ratios.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 4; art. no. e145939
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the influence of airflow resistance of layered porous structures on the sound absorption coefficient
    Autorzy:
    Flach, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/24201972.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    airflow resistance
    anechoic wedges
    transfer matrix method
    optimization
    PSO
    particle swarm optimization
    opór przepływu powietrza
    kliny akustyczne
    metoda macierzy przejścia
    optymalizacja
    optymalizacja roju cząstek
    Opis:
    The paper presents the research on the influence of airflow resistance on the sound absorption coefficient of layered porous structures. For the calculation of the sound absorption coefficient, the models of layered sound-absorbing structures were developed with the use of numerical computational models. Using the developed models, optimization was carried out to maximize the average sound absorption coefficient of the structures for a given frequency range. As a result of the research, the dependence of the change in airflow resistance for the successive layers of the material was determined. The results of the work will be particularly useful in the design of wedges used in anechoic chambers.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022311
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance characteristics of panel filters for internal combustion engine inlet air working in a two-stage configuration
    Autorzy:
    Dziubak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/243465.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    two-stage air filter
    filter medium
    separation efficiency
    flow resistance
    absorption coefficient of dust
    dwustopniowy filtr powietrza
    medium filtracyjne
    skuteczność separacji
    opór przepływu
    współczynnik pochłaniania pyłu
    Opis:
    Air filtration conditions in a single-stage and a two-stage filtration system (multicyclone-porous panel filter) are presented. Allowable flow resistance Δpfdop values reducing the air filter service life are specified. The benefits of using a multicyclone as a first stage of air filtration, including improved mobility and extended service life, are discussed. Criteria for selecting the filter media for the automobile air intake system using an absorption coefficient of dust km determined at a specific allowable flow resistance Δpfdop are specified. New methods and conditions to determine the absorption coefficient of dust km for article filter and non-woven fabric filter in a single-stage and a two-stage filtration system are developed and presented. The separation efficiency and separation performance as well as the flow resistance characteristics of the filter set including a single cyclone and a filter element with a specially selected filter medium surface area are tested. Absorption coefficients of dust km for the tested paper filter and non-woven fabric filter were determined for an allowable flow resistance. The effects of dust particle size distribution in the air downstream of the cyclone on reducing the absorption coefficient of dust of the paper filter and non-woven fabric filter in a two-stage filtration system are shown.
    Źródło:
    Journal of KONES; 2018, 25, 1; 83-94
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential design improvements of a reverse flow mini-cyclone with a tangential inlet
    Autorzy:
    Dziubak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/185760.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air filter
    mini-cyclones
    separation efficiency
    separation performance
    flow resistance
    dust particle size distribution
    filtr powietrza
    minikomocyklony
    skuteczność separacji
    wydajność separacji
    opór przepływu
    rozkład wielkości cząstek pyłu
    Opis:
    This paper presents an effect of general dimensions of a reverse flow mini-cyclone with a tangential inlet on its separation efficiency. Several mini-cyclone design modifications are presented and evaluated for use in the air filtration systems of motor vehicles. Local design improvements of three components of a reverse flow mini-cyclone with a tangential inlet D-40 of an air filter fitted in an all-terrain vehicle engine were introduced. An asymmetric curvilinear shape of an outlet port was used instead of a symmetrical shape. An outlet vortex finder inlet port shape was streamlined, and a cylindrical outlet vortex finder of the cyclone was replaced with a conical one. Experimental evaluation of the effects of the design improvements of mini-cyclone on its separation efficiency and performance as well as flow resistance was carried out. Separation efficiency of the cyclone was determined using the mass method as a product of dust mass retained by the mini-cyclone and supplied to the mini-cyclone in a specified time. Separation performance of the cyclone was determined as the largest dust particle dz =dzmax in a specific test cycle in the cyclone outlet air stream. A polydisperse PTC-D test dust used in Poland, a substitute for AC-fine test dust was used. Dust concentration at the mini-cyclone inlet was kept at 1 g/m3. The size and total number of dust particles in the air stream at the outlet of the original mini-cyclone and at the outlet of the improved mini-cyclone was determined using a particle counter.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 1; 15--31
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of the Nonsteady-State Filtration Process in a Fibrous Material in Conditions of Real Dust Loading
    Autorzy:
    Majchrzycka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/90344.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    air filtration
    fibrous filtering material
    particular deposition
    filtration efficiency
    clogging test
    gas flow resistance
    model of nonsteady-state filtration
    filtracja powietrza
    materiał filtracyjny
    skuteczność filtracji
    opór przepływu gazu
    Opis:
    The study concerns ways to describe filtration efficiency and gas flow resistance while particles are deposited in fibrous respiratory protective filters under conditions characteristic for their use. The performance of fibrous filter materials of varied structure and electrostatic properties was studied, using polydisperse coarse-grained aerosols and submicron aerosols of sodium chloride. Evidence was found that changes in airflow resistance depended to a large extent on air humidity and the concentration of the aerosol. A relationship was also found between the electrostatic properties of filter media and their decreasing efficiency with time. A numerical model was developed to simulate the phenomenon of nonsteady-state filtration for 2 mechanisms of deposition, which permitted assessment of the filtration characteristics of filter media of any design and in any conditions.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, Zeszyt Specjalny; 45-58
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of hydraulic resistance in polypropylene pipe fittings
    Opory hydrauliczne w kształtkach z polipropylenu
    Autorzy:
    Cisowska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/402356.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    kształtki
    ciśnienie przepływu
    opór miejscowy
    pipe fittings
    pressure flow
    local resistance
    Opis:
    The results of studies of local hydraulic resistance in polypropylene segmental elbows (R/d ≤ 1) and bends (R/d > 1) in systems of two or more pipe fittings connected in series are analyzed. Qualitative and quantitative formulas for the coefficient of local resistance in pipelines built from elbows and bends connected conformingly (forming spiral loops) or alternatinvely (forming sinusoidal waves) are presented.
    Źródło:
    Structure and Environment; 2009, 1, 1; 53-58
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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